Effects of high temperature on reproduction

Hafez, E. S. E.

doi:10.1007/bf02187454

Cited by 26 publications

(9 citation statements)

References 41 publications

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“…Another in vitro study found that when the follicular wall is exposed to high temperature, follicular steroidogenesis, androstenedione, and estradiol levels are reduced [ 114 ]. In mammals, high temperature triggers irregularities in cycle length, ovulation rate, morphological abnormalities in ova, and reduction in the size of the fetus [ 115 ]. Temperatures above optimum levels also impede secretion of reproductive hormones such as luteinizing hormone (LH), follicle stimulating hormone (FSH), and progesterone in bovine species [ 116 ].…”

Section: Covid-19 and Mediators Of Infertilitymentioning

confidence: 99%

Understanding the cross-talk between mediators of infertility and COVID-19

Rajak

Roy

Dutta

et al. 2021

Reproductive Biology

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Section: Covid-19 and Mediators Of Infertilitymentioning

confidence: 99%

Understanding the cross-talk between mediators of infertility and COVID-19

Rajak

Roy

Dutta

et al. 2021

Reproductive Biology

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“…Animals exposed to high ambient temperatures exhibit poor reproductive performance (Hafez, 1964;Edwards, 1974). Embryonic mortality is one of the most important reproductive consequences of heat stress and is one of the least understood because of its many origins.…”

Section: Introductionmentioning

confidence: 99%

Analysis of post-implantation mouse embryos after maternal heat stress during meiotic maturation

Baumgartner¹,

Chrisman²

1988

Reproduction

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The effects of heat stress during oocyte maturation were studied in post-implantation mouse embryos. Virgin ICR mice were exposed to 35 +/- 1 degree C and 65 +/- 3% RH for 12.5 h beginning immediately after synchronization of ovulation with PMSG and hCG. Embryos of heat-stressed dams were developmentally heterogeneous and showed significant delays in development with as much as 48 h delayed development. Nearly 6% of these embryos were triploid, and another 2% were hyper-diploid. Development of triploid embryos was delayed more than 24 h. Nine embryos with severe developmental delay had heterogeneous chromosome constitutions. Embryo mortality before and after implantation was higher in heat-stressed dams than in controls.

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“…Several authors have recently reviewed the influence of season and temperature on the reproductive performance of mammals: Bianca, 1965;Dutt, 1959;Hafez, 1964Hafez, , 1965Ingraham, 1974;Roller and Stombaugh, 1974;Ulberg, 1958Ulberg, , 1967Vincent, 1972;Waites, 1976. They conclude that the depressive effect of climatic stress on fertility is probably its most important influence on animal productivity in the tropics.…”

Section: Reproductionmentioning

confidence: 99%

2.1 Methods of alleviating the deleterious effects of tropical climates on animal production

Richards

1981

BSAP Occas. Publ.

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INTRODUCTIONAs a consequence of the rapidly expanding population and the general recognition of the need for more efficient food production in the less developed countries, there is currently much interest in the establishment of intensive animal production units therein. However, traditional animal production enterprises in these countries, particularly in those with hot humid climates, are noted for their low productivity and poor reproductive rates. Consequently, only a few of the intensive units established in these locations have been successful. The most common factors associated with this failure are, inexperience in 'farming' animals, mismanagement, inappropriate animal types, inadequate housing and planning and ignorance of the deleterious effects of tropical environments on animals and production systems and on means of alleviating them.Ever since animals were domesticated, man realized that climatic changes resulted in dramatic influences on their behaviour and performance. In an attempt to ameliorate these effects, enormous energy has since been expended in the developed world in modifying traditional housing, feeding and management practices. However, the problems faced by animals in the tropics are particularly difficult, especially in the low income countries, not only because they are exposed to periods of extremely hot/humid weather but also because financial constraints have precluded the employment of many of the available methods of ameliorating the effects of climate on production. Clearly, the fate of many of these nations will depend on man's ability to overcome these difficulties. Thus far, research and development efforts have been mainly concerned with: * the importation of high producing animals or their genes from temperate regions, crossing them with tropically adapted species and subsequently selecting those that are adaptable and productive; * designing suitable housing to counteract the rigours of climate; and * developing the most efficient ways of animal management and feeding.The object of this paper is to briefly describe the physiological and productive responses of animals maintained in hot environments and to categorise the practical methods currently available of alleviating the depressive effects. The majority of the work quoted will relate to cattle. RESPONSE OF CATTLE TO HOT/HUMID TROPICAL.CLIMATESClimate is one of many features of the tropical environment which limit animal production; others include nutrition, endo-and ecto-parasites, disease, soil fertility, etc. (McDowell, 1968). The depressive effects of tropical climates are very difficult to quantify because they reflect responses to four factors: * to the direct effect of diurnal heat loads -various combinations of solar radiation, environmental temperature, relative humidity, wind, rainfall and oxygen tension (altitude) -on the energy needs of the animal; 58 RICHARDS * to the indirect effects of heat loads on the type, amount, availability and quality of feed and water, the prevalence of disease, helminth load, ...

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Effects of high temperature on reproduction

Cited by 26 publications

References 41 publications

Understanding the cross-talk between mediators of infertility and COVID-19

Understanding the cross-talk between mediators of infertility and COVID-19

Analysis of post-implantation mouse embryos after maternal heat stress during meiotic maturation

2.1 Methods of alleviating the deleterious effects of tropical climates on animal production

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